Cascade utilization of LNG cold energy by integrating cryogenic energy storage, organic Rankine cycle and direct cooling

He, Tianbiao; Hong-yu, LV; Shao, Zhongwu; Zhang, Jibao; Xing, Xialian; Ma, Huigang

doi:10.1016/j.apenergy.2020.115570

Cited by 92 publications

(18 citation statements)

References 35 publications

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“…Exergy is the maximum power generated by a system when it is transferred from the current state to the environmental state (Moran et al, 2014). If the potential and kinetic exergies are ignored, the exergy of a material stream can be defined as (He et al, 2020a): E =ṁ(e ph + e ch )…”

Section: Exergy Analysismentioning

confidence: 99%

Black Hole-Inspired Optimal Design of Biomethane Liquefaction Process for Small-Scale Applications

Qyyum

Zhou

et al. 2021

Front. Energy Res.

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Biomethane is regarded as a promising renewable energy source, with great potential to satisfy the growth of energy demands and to reduce greenhouse gas emissions. Liquefaction is a suitable approach for long distances and overseas transportation of biomethane; however, it is energy-intensive due to its cryogenic working condition. The major challenge is to design a high-energy efficiency liquefaction process with simple operation and configuration. A single mixed refrigerant biomethane liquefaction process adopting the cryogenic liquid turbine for small-scale production has been proposed in this study to address this issue. The optimal design corresponding to minimal energy consumption was obtained through the black-hole-based optimization algorithm. The effect of the minimum internal temperature approach (MITA) in the main cryogenic heat exchanger on the biomethane liquefaction process performance was investigated. The study results indicated that the specific energy consumption of modified case 2 with MITA of 2°C was 0.3228 kWh/kg with 21.01% reduction compared to the published base case. When the MITA decreased to 1°C, the specific power of modified case 1 reduced to 0.3162 kWh/kg, which was 24.96% lower than the base case. In terms of exergy analysis, the total exergy destruction of the modified cases 1, 2, and 3 was 31.28%, 22.27%, and 17.51% lower than the base case, respectively. This study’s findings suggested that introducing the cryogenic liquid turbine to the single mixed refrigerant-based biomethane liquefaction process could reduce the specific energy consumption and total exergy destruction significantly. Therefore, this study could provide a viable path for designing and improving the small-scale biomethane liquefaction process.

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Section: Exergy Analysismentioning

confidence: 99%

Black Hole-Inspired Optimal Design of Biomethane Liquefaction Process for Small-Scale Applications

Qyyum

Zhou

et al. 2021

Front. Energy Res.

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“…35 Parikhani et al 36 studied the thermodynamic performance and optimal ammonia concentration of a novel multigeneration system driven by a geothermal heat source and LNG cold energy under different heat source temperatures. He et al 37 determined the optimal components and compositions of mixed working fluids in ORCs under different temperature ranges of LNG cold energy cascade utilization systems. The results indicated that the optimal compositions of the mixed working fluids in ORC-1 (ethane: 23.73%, ethylene: 15.01%, R134a: 20.17%, and R152a: 41.09%) and ORC-2 (ethylene: 60.14%, R134a: 38.73%, R1270: 0.54%, and R134a: 0.59%) were distinctive.…”

Section: ■ Introductionmentioning

confidence: 99%

Thermodynamic Optimization of a Composition-Tunable Zeotropic ORC Using LNG Cold Energy as a Heat Sink

Chen

et al. 2022

ACS Sustainable Chem. Eng.

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The organic Rankine cycle (ORC) is a promising power generation cycle to fully utilize the cold energy of liquid natural gas (LNG). ORC is usually operated under variable working conditions, and the operation performance is significantly worse than under design conditions. In this paper, a novel composition-tunable zeotropic ORC using LNG cold energybased liquid-separation condenser is proposed and a thermodynamic optimization model is formulated. A case study is then conducted to validate the superiority of the proposed ORC and analyze the important operation parameters to explore the reasons for the performance advantages of the novel system. The results show that the novel ORC has a higher evaporation temperature, lower condensation temperature, lower condensation pressure, and lower pinch point temperature difference than the basic ORC. The exergy loss of the condenser is reduced, and the exergy efficiency is improved. The novel ORC features 2.86% higher annual average net power output, 2.47% higher annual average thermal efficiency, 2.85% higher annual utilization efficiency of cold energy, and 2.76% higher annual exergy efficiency of cold energy recovery than the basic ORC.

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“…The power generation of this new system was 95.67 MJ y −1 m −2 , but the energy efficiency was only 3.28%. He and Lv et al [ 8 ] examined a new power generation system, which integrated cryogenic energy storage, ORC, and direct cooling technology to recover LNG cold energy in the range of low, medium, and high temperature, respectively. The results showed that exergy efficiency was 73.92%, but the net power generation was only 103.3 kW.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Optimization of a Novel Combined Cooling, Heating, and Power System‐Integrated Rankine Cycle and Brayton Cycle Utilizing the Liquified Natural Gas Cold Energy

et al. 2022

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In recent years, the efficient utilization of energy has become a hot issue in scientific research. Society needs sustainable development. Fossil energy will gradually withdraw from the stage of energy utilization in the future, and the significance of clean energy becomes increasingly prominent. Natural gas (NG) stands out for its superior characteristics among many clean energy sources. It is generally accepted as the cleanest fossil energy source in the world, [1] which has advantages of high calorific value and economic and environmental protection. NG emits very little greenhouse gas during the combustion process, and its application can greatly reduce the global greenhouse effect. NG is liquid state when stored and when in short distance transported, liquefied natural gas (LNG) is colorless, nontoxic, odorless and noncorrosive, and is 600 times the volume of NG. [2,3] The temperature is À162 °C at 101.325 kPa, LNG will be gasified to more than 25 °C before being transported to the gas user terminal, and the huge cold energy will be released simultaneously. Utilizing this part of energy rationally will produce excellent benefits.At present, LNG cold energy is mainly used as a cold source and applied to the combined power generation, refrigeration, and heating cycle engineering fields with thermal energy (industrial waste heat, solar energy, geothermal energy, etc.) together. In the past decade, there have been extensive in-depth researches conducted in this direction by many scholars. Lee et al. [4] designed and

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Cascade utilization of LNG cold energy by integrating cryogenic energy storage, organic Rankine cycle and direct cooling

Cited by 92 publications

References 35 publications

Black Hole-Inspired Optimal Design of Biomethane Liquefaction Process for Small-Scale Applications

Black Hole-Inspired Optimal Design of Biomethane Liquefaction Process for Small-Scale Applications

Thermodynamic Optimization of a Composition-Tunable Zeotropic ORC Using LNG Cold Energy as a Heat Sink

Performance Analysis and Optimization of a Novel Combined Cooling, Heating, and Power System‐Integrated Rankine Cycle and Brayton Cycle Utilizing the Liquified Natural Gas Cold Energy

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